CN118392683A - Torsion experimental device for transient release of torsion force - Google Patents

Abstract

The invention relates to the technical field of mechanical experiment devices, in particular to a torsion experiment device capable of releasing torsion in a transient state, which comprises a counter-force seat, an incident rod, a torsion bar, a torsion-resistant fixing mechanism, a torque control rod and a torque loading mechanism, wherein the first end of the incident rod faces the counter-force seat along the length direction, and the first end of the incident rod and the counter-force seat are used for clamping a sample together; the second end of the incident rod is connected with the first end of the torsion bar, the second end of the torsion bar is connected with the first end of the torque control rod, and the second end of the torque control rod is connected with the torque loading mechanism; the torsion-resistant fixing mechanism is sleeved on the torsion bar and is used for limiting the torsion bar to rotate along a first rotation direction; when the torque loading mechanism applies torque to the torque control rod along the first rotating direction until the torque control rod is broken, the torsion bar rotates along the second rotating direction opposite to the first rotating direction and transmits the torque to the incident rod, so that the structural stability of the torsion experimental device for transient release of torsion force is improved.

Description

Torsion experimental device for transient release of torsion force

Technical Field

The invention relates to the technical field of mechanical experiment devices, in particular to a torsion experiment device for releasing torsion force in a transient state.

Background

The torsion test device is a device which can be used to measure the shear modulus of a material and generally comprises a long rod and a rigid support. During the measurement, the test specimen is clamped on two fixed clamps and a torsion force is applied by rotating the lever. The shear modulus of the material can be calculated according to the elastic principle and the geometric principle. The shear modulus of solid materials and viscous liquids can be measured using a torsion experimental device, and the instrument has wide application in the fields of chemistry, machinery, geology, etc.

In the prior art, the structure of the experimental device, the material of the experimental device and the like are limited, and the traditional torsion experimental device has the problems that the experimental device is complex to assemble, an incident rod needs an additional clamping device, the experimental result precision is lower and the like.

Disclosure of Invention

In order to solve the problems that the traditional torsion experimental device is complex in assembly, an additional clamping device is needed for an incident rod, the experimental result precision is low and the like, the invention provides a torsion experimental device for transient release of torsion force, which comprises a counter-force seat, an incident rod, a torsion bar, a torsion fixing mechanism, a torque control rod and a torque loading mechanism,

Along the length direction, the first end of the incidence rod faces the counterforce seat, and the first end of the incidence rod and the counterforce seat are used for clamping a sample together; the second end of the incidence rod is connected with the first end of the torsion bar, the second end of the torsion bar is connected with the first end of the torque control rod, and the second end of the torque control rod is connected with the torque loading mechanism;

the torsion-resistant fixing mechanism is sleeved on the torsion bar and is used for limiting the torsion bar to rotate along a first rotation direction;

When the torque loading mechanism applies torque to the torque control rod along the first rotating direction to break the torque control rod, the torsion bar rotates along a second rotating direction opposite to the first rotating direction and transmits the torque to the incidence rod.

In some embodiments, the torsion experimental device for transient release of torsion force further comprises a shaft pressure loading mechanism sleeved on the torsion bar, wherein the shaft pressure loading mechanism is positioned between the incident rod and the torsion fixing mechanism along the length direction; the axial pressure loading mechanism is used for applying thrust force along the length direction to the torsion bar.

In some embodiments, the axial compression loading mechanism comprises a thrust bearing, a ball screw pair, and a first motor;

The thrust bearing is sleeved on the outer peripheral surface of the torsion bar and is connected with the output shaft of the first motor through the ball screw pair; when the output shaft of the first motor rotates, the ball screw pair applies thrust along the length direction to the thrust bearing.

In some embodiments, the torque control rod comprises a first connecting section, a second connecting section and a third connecting section which are sequentially connected along the length direction, wherein two ends of the first connecting section are respectively connected with the torsion bar and the second connecting section, and two ends of the third connecting section are respectively connected with the second connecting section and the torque loading mechanism; the second connecting section is a cylinder, and the cross-sectional area of the second connecting section is smaller than the cross-sectional areas of the first connecting section and the third connecting section;

when the torque loading mechanism applies torque to the torque control rod along the first rotating direction to break the second connecting section, the torque value transmitted to the incidence rod is determined by the following formula:

Wherein T is a torque value conducted to the incident rod; θ is a torsion angle of the second connection section; g is the material shear modulus of the second connecting section; d is the diameter of the second connecting section; l is the length of the second connecting section; j is the polarization coefficient, an K ₁、k₂、k₃、k₄ are empirical coefficients.

In some embodiments, the torsion bar comprises a fourth connecting section, a fifth connecting section and a sixth connecting section which are sequentially connected along the length direction, wherein two ends of the fourth connecting section are respectively connected with the incident rod and the fifth connecting section, and two ends of the sixth connecting section are respectively connected with the fifth connecting section and the first connecting section;

The fifth connecting section is a cylinder, and the diameter ratio of the second connecting section to the fifth connecting section is greater than or equal to 0.2 and less than or equal to 0.3; the ratio of the length to the diameter of the second connecting section is greater than or equal to 5 and less than or equal to 6; the value of k ₃ is more than or equal to 0.1 and less than or equal to 0.2; the value of k ₁ is greater than or equal to 0.4 and less than or equal to 0.6.

In some embodiments, the incident bar is a hollow bar and the torsion bar is a solid bar;

The torsion bar comprises a fourth connecting section, a fifth connecting section and a sixth connecting section which are sequentially connected along the length direction; the first end of the fourth connecting section is embedded in the second end of the incident rod; and two ends of the sixth connecting section are respectively connected with the fifth connecting section and the first end of the torque control rod.

In some embodiments, the torque loading mechanism comprises a second motor, an output shaft of which is connected to a second end of the torque control rod; the second motor is configured to apply torque to the torque control rod in the first rotational direction.

In some embodiments, the anti-torque securing mechanism includes an anti-torque securing frame, a first clamp, and a second clamp; wherein,

The first clamping piece and the second clamping piece are both arranged on the torsion-resistant fixing frame, the first clamping piece and the second clamping piece are movably connected and enclose to form a clamping hole, and the torsion bar passes through the clamping hole;

when the torque control rod rotates along the first rotating direction, the first clamping piece and the second clamping piece limit the torsion bar to rotate along the first rotating direction;

When the torque loading mechanism applies torque to the torque control rod along the first rotation direction until the torque control rod is broken, the torsion bar drives the first clamping piece and the second clamping piece to rotate along the second rotation direction, so that the cross section of the clamping hole is increased.

In some embodiments, the anti-twist fixation mechanism further comprises a first slider, a first slide rail, a second slider, and a second slide rail; wherein,

The first sliding block is in sliding connection with the first sliding rail, the second sliding block is in sliding connection with the second sliding rail, the first sliding rail and the second sliding rail are both installed on the torsion-resistant fixing frame, the first sliding block is fixedly connected with the first clamping piece, and the second sliding block is fixedly connected with the second clamping piece.

In some embodiments, the anti-torque securing mechanism further comprises a first stop and a second stop; wherein,

The first limiting piece is connected with the first sliding rail, and the second limiting piece is connected with the second sliding rail; the first limiting piece and the second limiting piece are used for limiting the first sliding block to slide relative to the first sliding rail and limiting the second sliding block to slide relative to the second sliding rail when the torque control rod rotates along the first rotating direction.

According to the torsion experimental device for transient release of torsion force, which is provided by the invention, the torsion bar is connected with the torsion loading mechanism through the torsion control rod, so that the connection structure of the torsion experimental device for transient release of torsion force can be simplified. Meanwhile, the torque control rod is positioned at the end part of the torsion experimental device for transient release of torsion, compared with the traditional torsion experimental device, the operation of installing the torque control rod is simpler, the installation efficiency is higher, meanwhile, the weight of the torsion experimental device for transient release of torsion is balanced, the structure of the torsion experimental device for transient release of torsion can be optimized, the stability of the torsion experimental device for transient release of torsion is improved, and meanwhile, the accuracy of a measurement result is realized.

Drawings

FIG. 1 is a partial cross-sectional view of a first view of a torsion test apparatus for transient release of torsion force according to an embodiment of the present application;

FIG. 2 is a partial cross-sectional view of a second view of a torsion test apparatus for transient release of torsion force according to an embodiment of the present application;

Fig. 3 is a cross-sectional view of the torsion test apparatus for transient release of torsion force in the direction 1-1 according to the embodiment of the present application shown in fig. 1.

Reference numerals: 100 reaction force seats, 200 incidence rods, 300 torsion bars, 400 torsion-resistant fixing mechanisms, 401 torsion-resistant fixing frames, 402 first clamping pieces, 403 second clamping pieces, 404 first sliding blocks, 405 first sliding rails, 406 second sliding blocks, 407 second sliding rails, 408 first limiting pieces, 409 second limiting pieces, 500 torque control rods, 600 torque loading mechanisms, 601 second motors, 700 shaft pressure loading mechanisms, 701 thrust bearings, 702 ball screw pairs, 703 first motors and 800 samples.

Detailed Description

The disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those of ordinary skill in the art to better understand and thus practice the present disclosure, and are not meant to imply any limitation on the scope of the present disclosure.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment. The term "another embodiment" is to be interpreted as "at least one other embodiment".

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The embodiment discloses a torsion experimental device for transient release of torsion force, as shown in fig. 1 and 2, the torsion experimental device for transient release of torsion force comprises a reaction seat 100, an incident rod 200, a torsion bar 300, a torsion fixing mechanism 400, a torque control rod 500 and a torque loading mechanism 600, wherein, along the length direction, a first end of the incident rod 200 faces the reaction seat 100, and the first end of the incident rod 200 and the reaction seat 100 are used for clamping a sample 800 together; a second end of incident beam 200 is connected to a first end of torsion bar 300, a second end of torsion bar 300 is connected to a first end of torque control rod 500, and a second end of torque control rod 500 is connected to torque loading mechanism 600.

The torsion fixing mechanism 400 is sleeved on the torsion bar 300, and the torsion fixing mechanism 400 is used for limiting the torsion bar 300 to rotate along the first rotation direction.

When torque loading mechanism 600 applies torque to torque control rod 500 in a first rotational direction to break torque control rod 500, torsion bar 300 rotates in a second rotational direction opposite the first rotational direction and transmits torque to incident beam 200.

In this embodiment, the reaction seat 100 is used to clamp the sample 800 together with the first end of the incident rod 200, bear the moment of the incident rod 200, and prevent the sample 800 from shifting during the experiment, where the specific structure of the reaction seat 100 is not limited, and can be reasonably selected according to the practical application requirements.

In this embodiment, the incident rod 200 is used to clamp the sample 800 together with the reaction seat 100 and transmit the torque of the torsion bar 300 to the sample 800, and the specific structure is not limited, and may be reasonably selected according to practical application requirements. For example: the incident beam 200 may be a hollow beam or a solid beam.

In this embodiment, the torsion bar 300 is used to transmit the torque of the torque control rod 500, and the specific structure is not limited and may be reasonably selected according to the actual application requirements. For example: torsion bar 300 may be a hollow bar or a solid bar.

In this embodiment, the torsion-resistant fixing mechanism 400 is used to limit the torsion bar 300 to rotate along the first rotation direction, and the specific structural form is not limited, and may be reasonably selected according to practical application requirements. For example: may be a motor torque limiter, a disc torque limiter, a hydraulic torque limiter, a torsion fixation frame, etc.

In the present embodiment, torque control rod 500 is used to transmit the torque of torque loading mechanism 600 to torsion bar 300 while releasing the rotation restriction of torsion bar 300 by the breakage of torque control rod 500, causing torsion bar 300 to rotate in a second rotation direction opposite to the first rotation direction.

In this embodiment, the torque loading mechanism 600 is used to apply torque along the first rotation direction to the torque control rod 500, and the specific structure is not limited and may be reasonably selected according to the practical application requirements. For example: can be a servo motor, a hydraulic pump, a motor, etc.

In the present embodiment, when performing an experiment using a torsion experimental apparatus for transient release of torsion force, first, by moving the incident lever 200 in the length direction, the sample 800 is clamped between the first end of the incident lever 200 and the reaction force seat 100, the second end of the incident lever 200 is connected to the first end of the torsion bar 300, the second end of the torsion bar 300 is connected to the first end of the torque control rod 500, the second end of the torque control rod 500 is connected to the torque loading mechanism 600, and the torsion fixing mechanism 400 is sleeved on the torsion bar 300; then, torque is applied to the torque control rod 500 along the first rotation direction by using the torque loading mechanism 600, the torque control rod 500 drives the torsion bar 300 to rotate along the first rotation direction, and the torsion fixing mechanism 400 limits the torsion bar 300 to rotate, so that the torsion bar 300 generates elastic deformation to store the torque applied by the torque loading mechanism 600; finally, when the torque applied to the torsion bar 300 does not reach the experimental preset value, the torsion bar 500 is not broken, the torsion bar 300 continues to store the torque applied by the torque loading mechanism 600, and when the torque applied to the torsion bar 300 reaches the experimental preset value, the torque loading mechanism 600 applies the torque to the torsion bar 500 in the first rotational direction to break the torsion bar 500, the torsion fixing mechanism 400 releases the torsion bar 300 rotation restriction, the torsion bar 300 rotation releases the stored torque, the torsion bar 300 rotates in the second rotational direction opposite to the first rotational direction, the torsion bar 300 rotation transmits the torque to the incident bar 200, the incident bar 200 transmits the torque to the sample 800 between the incident bar 200 and the reaction seat 100, and the torsion experiment of transient releasing the torsion force is completed.

In the present embodiment, the connection structure of the torsion experimental apparatus for transient release of torsion force can be simplified by connecting torsion bar 300 and torque loading mechanism 600 through torque control rod 500. Meanwhile, the torque control rod 500 is located at the end part of the torsion experimental device for transient release of torsion, compared with a traditional torsion experimental device, the operation of installing the torque control rod 500 is simpler, the installation efficiency is higher, meanwhile, the weight of the torsion experimental device for transient release of torsion is balanced, the structure of the torsion experimental device for transient release of torsion can be optimized, and the stability of the torsion experimental device for transient release of torsion is improved.

Optionally, as shown in fig. 1 and 2, the torsion experimental device for transient release of torsion force further includes an axial pressure loading mechanism 700 sleeved on the torsion bar 300, and the axial pressure loading mechanism 700 is located between the incident rod 200 and the torsion fixing mechanism 400 along the length direction; the axial pressure loading mechanism 700 is used to apply a thrust force in the longitudinal direction to the torsion bar 300.

In this embodiment, the axial compression loading mechanism 700 is used to apply a thrust force to the torsion bar 300 along the length direction, and the specific structure is not limited and may be reasonably selected according to practical application requirements. For example: the axle pressure loading mechanism 700 may be a hydraulic cylinder, a thrust cylinder, a pneumatic cylinder, a thrust bearing, or the like.

In this embodiment, by disposing the axial pressure loading mechanism 700 between the incident lever 200 and the torque fixing mechanism, axial pressure and torque can be applied to the torsion bar 300 at the same time, which is advantageous in improving the effect of mechanical experiments performed by using the torsion experiment device that transiently releases torsion force.

Further, as shown in fig. 2, the axial pressure loading mechanism 700 includes a thrust bearing 701, a ball screw pair 702, and a first motor 703.

The thrust bearing 701 is sleeved on the outer peripheral surface of the torsion bar 300, and the thrust bearing 701 is connected with the output shaft of the first motor 703 through the ball screw pair 702; when the output shaft of the first motor 703 rotates, the ball screw pair 702 applies thrust in the longitudinal direction to the thrust bearing 701.

In the present embodiment, by controlling the force applied to the thrust bearing 701, not only the thrust transmitted from the first motor 703 through the ball screw pair 702 can be stored by the thrust bearing 701, but also the thrust stored by the thrust bearing 701 can be released. The specific structure of the thrust bearing 701 is not limited, and may be reasonably selected according to practical application requirements. For example: the thrust bearing 701 may be comprised of one or more rolling elements rolling within a cage for bearing axial loads and one or more cages.

Further, in order to enable the sample 800 to be kept stable when the torsion bar 300 is twisted, it is ensured that the sample 800 does not displace and deform during the twisting process, so as to ensure the accuracy of the test result, the thrust bearing 701 is sleeved on the outer peripheral surface of the end of the torsion bar 300 away from the incident rod 200, and the thrust released by the thrust bearing 701 is transmitted to the sample 800 through the torsion bar 300 and the incident rod 200.

In this embodiment, the ball screw pair 702 may include a nut and a screw, the nut and the screw are in threaded connection, the screw is disposed along a length direction, and the motor drives the nut to rotate relative to the screw, so that the nut moves along the length direction and applies axial pressure along the length direction to the thrust bearing 701.

In this embodiment, the ball screw pair 702 is connected to the output shaft of the first motor 703, and the specific connection mode is not limited, and may be reasonably selected according to the actual application requirement. For example: the output shaft of the motor may be directly connected to the ball screw pair 702, or may be indirectly connected to the ball screw pair 702 via a speed reducer, a timing pulley, a transmission belt, or the like.

Alternatively, as shown in fig. 1 and 2, in order to calculate the torque value loaded on the sample 800 more accurately, the torque control rod 500 includes a first connection section (not shown), a second connection section (not shown), and a third connection section (not shown) connected in sequence along the length direction, wherein both ends of the first connection section are connected to the torsion bar 300 and the second connection section, respectively, and both ends of the third connection section are connected to the second connection section and the torque loading mechanism 600, respectively; the second connecting section is a cylinder, and the cross-sectional area of the second connecting section is smaller than the cross-sectional areas of the first connecting section and the third connecting section.

When torque loading mechanism 600 applies torque to torque control rod 500 in the first rotational direction to break the second connection segment, the value of the torque transmitted to incident lever 200 is determined by the following equation:

Wherein T is the torque value conducted to the incident lever 200; θ is the torsion angle of the second connection section; g is the material shear modulus of the second connecting section; d is the diameter of the second connecting section; l is the length of the second connecting section; j is the polarization coefficient, an K ₁、k₂、k₃、k₄ are empirical coefficients.

In this embodiment, k ₁、k₂、k₃、k₄ is an empirical coefficient, and the specific empirical coefficient is not limited in value and can be reasonably selected according to practical application requirements. For example: the value of k ₃ is more than or equal to 0.05 and less than or equal to 0.25; the value of k ₁ is more than or equal to 0.35 and less than or equal to 0.65; the value of k ₄ is more than or equal to 0.1 and less than or equal to 0.3; the value of k2 is greater than or equal to 0.7 and less than or equal to 1.2.

Further, as shown in fig. 1 and 2, in order to better eliminate the influence of different materials on the diameter of the second connection section of the torque control rod 500 and to eliminate the restriction of the length-diameter ratio while satisfying the design requirement, the torsion bar 300 includes a fourth connection section (not shown), a fifth connection section (not shown) and a sixth connection section (not shown) connected in sequence along the length direction, wherein both ends of the fourth connection section are connected with the incident rod 200 and the fifth connection section, respectively, and both ends of the sixth connection section are connected with the fifth connection section and the first connection section, respectively.

The fifth connecting section is a cylinder, and the diameter ratio of the second connecting section to the fifth connecting section is more than or equal to 0.2 and less than or equal to 0.3; the ratio of the length to the diameter of the second connecting section is greater than or equal to 5 and less than or equal to 6; the value of k ₃ is more than or equal to 0.1 and less than or equal to 0.2; the value of k ₁ is greater than or equal to 0.4 and less than or equal to 0.6.

Further, in order to better reduce the absolute influence of the diameter of the second connecting section of the torque control rod 500 on the polarization coefficient, k ₄ has a value greater than or equal to 0.15 and less than or equal to 0.25.

Further, in order to better control the shear modulus difference of different materials, the value of k2 is greater than or equal to 0.8 and less than or equal to 1.0.

Alternatively, as shown in fig. 1 and 2, the incident bar 200 is a hollow bar and the torsion bar 300 is a solid bar; torsion bar 300 includes a fourth connection section, a fifth connection section, and a sixth connection section that are connected in order in the length direction; the first end of the fourth connecting section is embedded in the second end of the incident rod 200; both ends of the sixth connection section are connected to the fifth connection section and the first end of the torque control rod 500, respectively. In this embodiment, by setting the incident rod 200 as a hollow rod, the amount of material used for the torsion test device for transient release of torsion force can be reduced, and the weight can be reduced while saving the cost. By providing torsion bar 300 as a solid bar, the strength of torsion bar 300 can be enhanced, and the maximum load value of torsion bar 300 can be raised.

In this embodiment, in order to achieve the detachable connection of the torsion bar 300 and the incident beam 200, the torsion experimental apparatus for facilitating the transient release of the torsion force is assembled, and the first end of the fourth connection section of the torsion bar 300 is embedded in the second end of the incident beam 200. The specific embedding manner of the torsion bar 300 and the incident bar 200 is not limited, and may be reasonably selected according to practical application requirements. For example: the connecting device can be in threaded connection or clamping connection.

In the present embodiment, the specific cross-sectional outer edge shapes and dimensions of torsion bar 300 and incident beam 200 are not limited, and may be appropriately selected according to practical application requirements. For example: the shape and size of the outer edge of the cross section of torsion bar 300 and the outer edge of the cross section of incident beam 200 are the same or different.

Further, as shown in fig. 1 and 2, in order to transmit torque and axial force well, the outer edge of the cross section of the fifth connection section of torsion bar 300 is the same shape and size as the outer edge of the cross section of incident beam 200.

Alternatively, as shown in FIG. 2, to facilitate control and calculation of the torque loading, the torque loading mechanism 600 includes a second motor 601, the output shaft of the second motor 601 being connected to the second end of the torque control rod 500; the second motor 601 is used to apply torque to the torque control rod 500 in a first rotational direction.

In this embodiment, the torque control rod 500 is connected to the output shaft of the second motor 601, and the specific connection mode is not limited, and may be reasonably selected according to the actual application requirement. For example: the output shaft of the motor can be directly connected with the torque control rod 500, or can be connected with the torque control rod 500 through a speed reducer, a synchronous pulley, a transmission belt and the like.

Alternatively, as shown in FIG. 3, the anti-torque securing mechanism 400 includes an anti-torque securing frame 401, a first clamp 402, and a second clamp 403; wherein, first clamping piece 402 and second clamping piece 403 are all installed on antitorque fixed frame 401, and first clamping piece 402 and second clamping piece 403 swing joint enclose and form the centre gripping hole, and torsion bar 300 passes the centre gripping hole setting.

When torque control rod 500 rotates in the first rotational direction, first clamp 402 and second clamp 403 together restrict torsion bar 300 from rotating in the first rotational direction.

When torque loading mechanism 600 applies torque to torque control rod 500 in the first rotational direction until torque control rod 500 breaks, torsion bar 300 drives first grip 402 and second grip 403 to rotate in the second rotational direction, so that the cross section of the grip hole increases.

In this embodiment, the torsion-resistant fixing frame 401 is used to bear the reaction force when the torsion bar 300 is loaded, so as to prevent the torsion bar 300 clamped by the first clamping member 402 and the second clamping member 403 from rotating along the first rotation direction, and ensure the accuracy of the experimental result.

In this embodiment, the first clamping member 402 and the second clamping member 403 are movably connected, and a specific movable connection manner is not limited, and may be reasonably selected according to practical application requirements. For example: the movable connection can be threaded connection, clamping connection, bolt connection and the like.

In the present embodiment, when torque control rod 500 rotates in the first rotation direction, first clamp 402 and second clamp 403 together restrict torsion bar 300 from rotating in the first rotation direction; the two clamps jointly limit the rotation of torsion bar 300 before torque control rod 500 breaks; when the torque loading mechanism 600 applies torque to the torque control rod 500 along the first rotation direction until the torque control rod 500 breaks, the torsion bar 300 drives the first clamping member 402 and the second clamping member 403 to rotate along the second rotation direction due to the contact between the torsion bar 300 and the two clamping members and the friction force generated when the torsion bar 300 and the two clamping members move, the first clamping member 402 and the second clamping member 403 generate centrifugal force away from the torsion bar 300 due to rotation, the cross section of the clamping hole formed by the encircling of the first clamping member 402 and the second clamping member 403 is increased, the friction force between the two clamping members and the torsion bar 300 is reduced or even no longer contacted, and the rotation restriction of the torsion bar 300 by the first clamping member 402 and the second clamping member 403 can be released, so that the torque can be conducted to the incident rod 200 through the torsion bar 300.

Further, as shown in fig. 3, in order to improve the stability of the movement of the two clamping members and to prevent the two clamping members from falling off after being disconnected, the anti-torsion fixing mechanism 400 further includes a first slider 404, a first sliding rail 405, a second slider 406 and a second sliding rail 407; the first sliding block 404 is slidably connected with the first sliding rail 405, the second sliding block 406 is slidably connected with the second sliding rail 407, the first sliding rail 405 and the second sliding rail 407 are both installed on the torsion-resistant fixing frame 401, the first sliding block 404 is fixedly connected with the first clamping piece 402, and the second sliding block 406 is fixedly connected with the second clamping piece 403.

Further, as shown in fig. 3, in order to avoid damage caused by excessive torsion force applied to the connection portion of the slider and the clamping member, the slider cannot slide along the first rotation direction relative to the sliding rail, and the first clamping member 402 and the second clamping member 403 cannot move along the first rotation direction, and the anti-torsion fixing mechanism 400 further includes a first limiting member 408 and a second limiting member 409; wherein, the first limiting member 408 is connected with the first sliding rail 405, and the second limiting member 409 is connected with the second sliding rail 407; the first and second stoppers 408 and 409 are used to restrict the first slider 404 from sliding relative to the first rail 405 and the second slider 406 from sliding relative to the second rail 407 when the torque control rod 500 rotates in the first rotational direction.

Further, as shown in fig. 3, in order to simplify the structure of the torsion experimental device for transient release of torsion force and make the torsion experimental device for transient release of torsion force have better stability, the first limiting member 408 and the second limiting member 409 are both boss structures and are both installed between the sliding rail and the torsion fixing frame 401.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. A torsion experimental device for transient release of torsion force is characterized by comprising a counter-force seat, an incident rod, a torsion bar, a torsion-resistant fixing mechanism, a torque control rod and a torque loading mechanism, wherein,

Along the length direction, the first end of the incidence rod faces the counterforce seat, and the first end of the incidence rod and the counterforce seat are used for clamping a sample together; the second end of the incidence rod is connected with the first end of the torsion bar, the second end of the torsion bar is connected with the first end of the torque control rod, and the second end of the torque control rod is connected with the torque loading mechanism;

the torsion-resistant fixing mechanism is sleeved on the torsion bar and is used for limiting the torsion bar to rotate along a first rotation direction;

When the torque loading mechanism applies torque to the torque control rod along the first rotating direction to break the torque control rod, the torsion bar rotates along a second rotating direction opposite to the first rotating direction and transmits the torque to the incidence rod.

2. The torsion test device for transient release of torsion force according to claim 1, further comprising an axial pressure loading mechanism sleeved on the torsion bar, the axial pressure loading mechanism being located between the incident bar and the torsion fixing mechanism along the length direction; the axial pressure loading mechanism is used for applying thrust force along the length direction to the torsion bar.

3. The torsion test device for transient release of torsion force according to claim 2, wherein the axial pressure loading mechanism includes a thrust bearing, a ball screw pair and a first motor;

The thrust bearing is sleeved on the outer peripheral surface of the torsion bar and is connected with the output shaft of the first motor through the ball screw pair; when the output shaft of the first motor rotates, the ball screw pair applies thrust along the length direction to the thrust bearing.

4. The torsion test device for transient release of torsion force according to claim 1, wherein the torque control rod comprises a first connecting section, a second connecting section and a third connecting section which are sequentially connected in a length direction, wherein two ends of the first connecting section are respectively connected with the torsion bar and the second connecting section, and two ends of the third connecting section are respectively connected with the second connecting section and the torque loading mechanism; the second connecting section is a cylinder, and the cross-sectional area of the second connecting section is smaller than the cross-sectional areas of the first connecting section and the third connecting section;

when the torque loading mechanism applies torque to the torque control rod along the first rotating direction to break the second connecting section, the torque value transmitted to the incidence rod is determined by the following formula:

Wherein T is a torque value conducted to the incident rod; θ is a torsion angle of the second connection section; g is the material shear modulus of the second connecting section; d is the diameter of the second connecting section; l is the length of the second connecting section; j is the polarization coefficient, an K ₁、k₂、k₃、k₄ are empirical coefficients.

5. The torsion test device for transient release of torsion force according to claim 4, wherein the torsion bar comprises a fourth connection section, a fifth connection section and a sixth connection section which are connected in sequence in a length direction, wherein both ends of the fourth connection section are respectively connected with the incident rod and the fifth connection section, and both ends of the sixth connection section are respectively connected with the fifth connection section and the first connection section;

The fifth connecting section is a cylinder, and the diameter ratio of the second connecting section to the fifth connecting section is greater than or equal to 0.2 and less than or equal to 0.3; the ratio of the length to the diameter of the second connecting section is greater than or equal to 5 and less than or equal to 6; the value of k ₃ is more than or equal to 0.1 and less than or equal to 0.2; the value of k ₁ is greater than or equal to 0.4 and less than or equal to 0.6.

6. The torsion test device for transient release of torsion force according to claim 1, wherein the incident bar is a hollow bar and the torsion bar is a solid bar;

The torsion bar comprises a fourth connecting section, a fifth connecting section and a sixth connecting section which are sequentially connected along the length direction; the first end of the fourth connecting section is embedded in the second end of the incident rod; and two ends of the sixth connecting section are respectively connected with the fifth connecting section and the first end of the torque control rod.

7. The torsion test device for transient release of torsion force according to claim 1, wherein the torque loading mechanism comprises a second motor, an output shaft of which is connected to a second end of the torque control rod; the second motor is configured to apply torque to the torque control rod in the first rotational direction.

8. The torsion test device for transient release of torsion force according to claim 1, wherein the torsion fixation mechanism comprises a torsion fixation frame, a first clamp, and a second clamp; wherein,

The first clamping piece and the second clamping piece are both arranged on the torsion-resistant fixing frame, the first clamping piece and the second clamping piece are movably connected and enclose to form a clamping hole, and the torsion bar passes through the clamping hole;

when the torque control rod rotates along the first rotating direction, the first clamping piece and the second clamping piece limit the torsion bar to rotate along the first rotating direction;

When the torque loading mechanism applies torque to the torque control rod along the first rotation direction until the torque control rod is broken, the torsion bar drives the first clamping piece and the second clamping piece to rotate along the second rotation direction, so that the cross section of the clamping hole is increased.

9. The torsion test device for transient release of torsion force according to claim 8, wherein the torsion resistant fixing mechanism further comprises a first slider, a first slide rail, a second slider, and a second slide rail; wherein,

The first sliding block is in sliding connection with the first sliding rail, the second sliding block is in sliding connection with the second sliding rail, the first sliding rail and the second sliding rail are both installed on the torsion-resistant fixing frame, the first sliding block is fixedly connected with the first clamping piece, and the second sliding block is fixedly connected with the second clamping piece.

10. The torsion test device for transient release of torsion force according to claim 9, wherein the torsion fixation mechanism further comprises a first stop and a second stop; wherein,

The first limiting piece is connected with the first sliding rail, and the second limiting piece is connected with the second sliding rail; the first limiting piece and the second limiting piece are used for limiting the first sliding block to slide relative to the first sliding rail and limiting the second sliding block to slide relative to the second sliding rail when the torque control rod rotates along the first rotating direction.